Can we reverse the process to keep my spouse in the Army if he makes weight/passes tape test?

To be more specific: AR 600-9; Chapter 3-14 (b) If, after 12 months but less than 36 months from the date of release from the ABCP, it is determined that a Soldier again exceeds the body fat standard, a DA Form 268 will be initiated on the Soldier. The Soldier will undergo a medical evaluation (2) If no underlying medical condition is found, the commander will re-enroll the Soldier in the ABCP. The Soldier will have 90 days to meet the standards. Soldiers who meet the body fat standard at the 90-day point will be released from the ABCP. Soldiers who do not meet the ABCP body fat standard at the 90-day point are considered ABCP failures. Commanders will initiate separation action, bar to reenlistment, or transfer to the IRR per paragraph 3–12d for all Soldiers who fail to meet the body fat standard at the 90-day point.

JAG won't help, they work for the commander and process the chapter.
Reversing it would mean that your husband is within compliance of height and weight standards. It's hard to request the commander make a special exception for your husband if he isn't within compliance.

Rosie Rodriguez If he was in the program twice in one year as you say; lost 3-7 pounds per month until he made weight or body composition and removed from the program and this happened twice , then he is done. Army Regulation 600-9 is the authority to do so.

Edited comments: I initially answered this from my iPhone, I reviewed chapter 3 of AR600-9 and it is so. I direct your attention to Para 3-12, 3-13, and 3-14.

I am sorry to hear that this is happening. I have personally wrestled with AR600-9 since 1989. It is what it is and there is no real appeal or loophole out of its grasp. You're either in or or out of compliance. Crash weight lose often has the unintended effect of losing Neck circumference, which makes your body fat measurement go up. From your initial comment, it sounds like the command is sending him for medical evaluation. Looking at 3-17, there are urban legends about magical medical conditions that will get you around 600-9. They are just that, urban legends. Anything that would make you gain weight to that degree would be a serious thyroid or endocrine condition that would likely be very bad for you...worse than just busting tape. I've never seen a medical condition that would waive the regulation.

Short of a time machine, I don't see a way to reverse this as you asked.